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LMD18400 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMD18400 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 18 page  TLH11026 June 1996 LMD18400 Quad High Side Driver General Description The LMD18400 is a fully protected quad high side driver It contains four common-drain DMOS N-channel power switches each capable of switching a continuous 1 Amp load (l3 Amps transient) to a common positive power sup- ply The switches are fully protected from excessive voltage current and temperature An instantaneous power sensing circuit calculates the product of the voltage across and the current through each DMOS switch and limits the power to a safe level The device can be disabled to produce a ‘‘sleep’’ condition reducing the supply current to less than 10 mA Separate ONOFF control of each switch is provided through standard LSTLLCMOS logic compatible inputs A MICROWIRETM compatible serial data interface is built in to provide extensive diagnostic information This information includes switch status readback output load fault conditions and thermal and overvoltage shutdown status There are also two direct-output error flags to provide an immediate indication of a general system fault and an indication of ex- cessive operating temperature The LMD18400 is packaged in a special power dissipating leadframe that reduces the junction to case thermal resist- ance to approximately 20 CW Features Y Four independent outputs with l3A peak 1A continu- ous current capability Y 13X maximum ON resistance over temperature Y True instantaneous power limit for each switch Y High survival voltage (60 VDC 80V transient) Y Shorted load (to ground and supply) protection Y Overvoltage shutdown at VCC l 35V Y LS TTLCMOS compatible logic inputs and outputs Y k 10 mA supply current in ‘‘sleep’’ mode Y b 5V output clamp for discharging inductive loads Y Serial data interface for 11 diagnostic checks Switch ONOFF status Open or shorted load Operating temperature Excessive supply voltage Y Two direct-output error flags Applications Y Relay and solenoid drivers Y High impedance automotive fuel injector drivers Y Lamp drivers Y Power supply switching Y Motor drivers Typical Application TLH11026 – 1 Connection Diagram TLH11026 – 2 Order Number LMD18400N See NS Package Number N20A TRI-STATE is a registered trademark of National Semiconductor Corporation MICROWIRETM is a trademark of National Semiconductor Corporation C1996 National Semiconductor Corporation RRD-B30M76Printed in U S A http www nationalcom |
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